...
Experiment
...
2:
...
February
...
28, 2010
Setup
This experiment consisted of one 10' Manifold with 1 in. holes drilled every 5 cm on one side of the pipe. This resulted in an Am/Avc = 1.
Results & Discussion
| Wiki Markup |
|---|
2010 h2. Setup This experiment consisted of one 10' Manifold with 1 in. holes drilled every 5 cm on one side of the pipe. This resulted in an Am/Avc = 1. h2. Results & Discussion {float} !10'ManifoldResults.png|width=450px! h5. Figure 1: 10' Manifold Results compared with theoretical expectations {float} |
The
...
results
...
of
...
our
...
second
...
experiment
...
seem
...
to
...
reaffirm
...
the
...
results
...
that
...
we
...
found
...
in
...
the
...
first
...
experiment,
...
despite
...
the
...
problems
...
with
...
data
...
collection
...
that
...
existed
...
in
...
the
...
first
...
experiment.
...
The
...
flow
...
starts
...
low
...
then
...
peaks
...
in
...
the
...
first
...
quarter
...
of
...
our
...
manifold
...
and
...
then
...
gradually
...
decreases
...
after
...
that.
...
And
...
as
...
showed
...
in
...
the
...
graph,
...
this
...
is
...
completely
...
opposite
...
what
...
the
...
theory
...
of
...
pressure
...
recovery
...
predicts.
...
The
...
good
...
news
...
with
...
these
...
results
...
is
...
that
...
the
...
flow
...
from
...
the
...
ports
...
might
...
be
...
sufficiently
...
uniform
...
for
...
it
...
to
...
work
...
in
...
the
...
AguaClara
...
plants.
...
The
...
mean
...
velocity
...
is
...
0.214
...
m/s
...
and
...
has
...
a
...
standard
...
deviation
...
of
...
0.021
...
m/s,
...
which
...
might
...
be
...
low
...
enough
...
variation
...
for
...
the
...
AguaClara
...
plants.
...
The
...
mean
...
velocity
...
might
...
be
...
a
...
little
...
high
...
when
...
considering
...
the
...
restriction
...
of
...
floc
...
breakup
...
prevention
...
as
...
there
...
is
...
an
...
average
...
energy
...
dissipation
...
rate
...
of
...
19
...
mW/kg
...
when
...
the
...
max
...
allowable
...
to
...
maintain
...
flocs
...
is
...
10
...
mW/kg.
...
This
...
was
...
determined
...
by
...
using
...
the
...
equation
...
| Latex |
|---|
...
$$
\varepsilon _{Max} = {1 \over {20D_{Port} }}\left( {{{V_{Port} } \over {K_{vc} }}} \right)^3 $$ |
...
We estimated the flow rate being provided by the pump to be 3.8 L/s. This value was calculated using the following equation:
| Latex |
|---|
$$
Q_{Manifold} = [\sum {(V_{Measured} \cdot A_{SedPort} } \cdot Pi_{vc} )] \cdot {{N_{portsTotal} } \over {N_{portsMeasured} }}
$$
|
This finds the average port flow of the measured ports and then multiplies it by the total number of ports. Given this flow rate, the velocity inside the manifold would be 0.21 m/s at the beginning of the manifold. This meets the specification of
| Latex |
|---|
$${V_{Scour}}$$ |
...
...
0.15
...
m/s
...
but
...
the
...
velocity
...
would
...
decrease
...
throughout
...
the
...
manifold.
...
However,
...
after
...
considering
...
the
...
fact
...
that
...
the
...
manifold
...
is
...
oriented
...
with
...
the
...
ports
...
pointed
...
downwards
...
in
...
the
...
sedimentation
...
tank,
...
we
...
have
...
realized
...
that
...
scour
...
velocity
...
is
...
not
...
as
...
big
...
of
...
an
...
issue
...
in
...
our
...
manifold
...
as
...
we
...
thought.
...
We
...
still
...
do
...
not
...
understand
...
the
...
fluid
...
mechanics
...
of
...
what
...
is
...
happening
...
in
...
the
...
manifold
...
and
...
need
...
to
...
investigate
...
that
...
further.
...
We
...
plan
...
on
...
doing
...
this
...
by
...
pushing
...
the
...
boundary
...
of
...
the
...
ratio
...
Am/Avc.
...
Theory
...
says
...
that
...
the
...
smaller
...
that
...
ratio
...
gets,
...
the
...
more
...
pressure
...
recovery
...
should
...
dominate
...
and
...
the
...
higher
...
velocity
...
should
...
be
...
at
...
the
...
end
...
of
...
the
...
manifold
...
compared
...
with
...
the
...
beginning
...
of
...
the
...
manifold
...
as
...
illustrated
...
in
...
...
...
on
...
the
...
main
...
page.
...
To
...
see
...
the
...
calculations
...
for
...
the
...
experiment,
...
use
...
the
...
...
...
and
...
the
...
...
...
.